/* Clutter.
 * An OpenGL based 'interactive canvas' library.
 * Authored By Matthew Allum  <mallum@openedhand.com>
 * Copyright (C) 2006-2007 OpenedHand
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "clutter-backend-x11.h"
#include "clutter-stage-x11.h"
#include "clutter-x11.h"

#include "../clutter-stage-window.h"
#include "../clutter-main.h"
#include "../clutter-feature.h"
#include "../clutter-color.h"
#include "../clutter-util.h"
#include "../clutter-event.h"
#include "../clutter-enum-types.h"
#include "../clutter-private.h"
#include "../clutter-debug.h"
#include "../clutter-units.h"

#include "cogl/cogl.h"

#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif

static void clutter_stage_window_iface_init (ClutterStageWindowIface *iface);

G_DEFINE_TYPE_WITH_CODE (ClutterStageX11,
                         clutter_stage_x11,
                         CLUTTER_TYPE_GROUP,
                         G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_STAGE_WINDOW,
                                                clutter_stage_window_iface_init));

#define _NET_WM_STATE_REMOVE        0    /* remove/unset property */
#define _NET_WM_STATE_ADD           1    /* add/set property */
#define _NET_WM_STATE_TOGGLE        2    /* toggle property  */

static void
send_wmspec_change_state (ClutterBackendX11 *backend_x11,
                          Window             window,
                          Atom               state,
                          gboolean           add)
{
  XClientMessageEvent xclient;

  memset (&xclient, 0, sizeof (xclient));

  xclient.type         = ClientMessage;
  xclient.window       = window;
  xclient.message_type = backend_x11->atom_NET_WM_STATE;
  xclient.format       = 32;

  xclient.data.l[0] = add ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE;
  xclient.data.l[1] = state;
  xclient.data.l[2] = 0;
  xclient.data.l[3] = 0;
  xclient.data.l[4] = 0;

  XSendEvent (backend_x11->xdpy, 
              DefaultRootWindow(backend_x11->xdpy), 
              False,
              SubstructureRedirectMask|SubstructureNotifyMask,
              (XEvent *)&xclient);
}

void
clutter_stage_x11_fix_window_size (ClutterStageX11 *stage_x11)
{
  gboolean resize;

  resize = clutter_stage_get_user_resizable (stage_x11->wrapper);

  if (stage_x11->xwin != None && stage_x11->is_foreign_xwin == FALSE)
    {
      XSizeHints *size_hints;

      size_hints = XAllocSizeHints();

      if (!resize)
        {
          size_hints->max_width = size_hints->min_width =
            stage_x11->xwin_width;
          size_hints->max_height = size_hints->min_height =
            stage_x11->xwin_height;
          size_hints->flags = PMinSize|PMaxSize;
        }

      XSetWMNormalHints (stage_x11->xdpy, stage_x11->xwin, size_hints);

      XFree(size_hints);
    }
}

static void
clutter_stage_x11_show (ClutterActor *actor)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (actor);

  if (stage_x11->xwin)
    {
      /* Fire off a redraw to avoid flicker on first map.
       * Appears not to work perfectly on intel drivers at least.
      */
      clutter_redraw (stage_x11->wrapper);

      XSync (stage_x11->xdpy, FALSE);
      XMapWindow (stage_x11->xdpy, stage_x11->xwin);
    }

  /* chain up */
  CLUTTER_ACTOR_CLASS (clutter_stage_x11_parent_class)->show (actor);
}

static void
clutter_stage_x11_hide (ClutterActor *actor)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (actor);

  if (stage_x11->xwin)
    XUnmapWindow (stage_x11->xdpy, stage_x11->xwin);

  /* chain up */
  CLUTTER_ACTOR_CLASS (clutter_stage_x11_parent_class)->hide (actor);
}

void
clutter_stage_x11_set_wm_protocols (ClutterStageX11 *stage_x11)
{
  ClutterBackendX11 *backend_x11 = stage_x11->backend;
  Atom protocols[2];
  int n = 0;
  
  protocols[n++] = backend_x11->atom_WM_DELETE_WINDOW;
  protocols[n++] = backend_x11->atom_NET_WM_PING;

  XSetWMProtocols (stage_x11->xdpy, stage_x11->xwin, protocols, n);
}

static void
clutter_stage_x11_query_coords (ClutterActor    *self,
                                ClutterActorBox *box)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (self);

  box->x1 = box->y1 = 0;
  box->x2 = box->x1 + CLUTTER_UNITS_FROM_INT (stage_x11->xwin_width);
  box->y2 = box->y1 + CLUTTER_UNITS_FROM_INT (stage_x11->xwin_height);
}

static void
clutter_stage_x11_request_coords (ClutterActor    *self,
                                  ClutterActorBox *box)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (self);
  gint new_width, new_height;

  new_width  = ABS (CLUTTER_UNITS_TO_INT (box->x2 - box->x1));
  new_height = ABS (CLUTTER_UNITS_TO_INT (box->y2 - box->y1)); 

  if (new_width != stage_x11->xwin_width
      || new_height != stage_x11->xwin_height)
    {
      stage_x11->xwin_width  = new_width;
      stage_x11->xwin_height = new_height;

      /* The 'handling_configure' flag below is used to prevent the
	 window from being resized again in response to a
	 ConfigureNotify event. Normally this will not be a problem
	 because the window will be resized to xwin_width and
	 xwin_height so the above test will prevent it from resizing
	 the window a second time. However if the stage is resized
	 multiple times without the events being processed in between
	 (eg, when calling g_object_set to set both width and height)
	 then there will be multiple ConfigureNotify events in the
	 queue. Handling the first event will undo the work of setting
	 the second property which will cause it to keep generating
	 events in an infinite loop. See bug #810 */
      if (stage_x11->xwin != None
	  && !stage_x11->is_foreign_xwin
	  && !stage_x11->handling_configure)
	XResizeWindow (stage_x11->xdpy, 
		       stage_x11->xwin,
		       stage_x11->xwin_width,
		       stage_x11->xwin_height);
      
      clutter_stage_x11_fix_window_size (stage_x11);
      
      if (stage_x11->xpixmap != None)
        {
          /* Need to recreate to resize */
          clutter_actor_unrealize (self);
          clutter_actor_realize (self);
        }

      CLUTTER_SET_PRIVATE_FLAGS (CLUTTER_ACTOR (stage_x11->wrapper),
                                 CLUTTER_ACTOR_SYNC_MATRICES);
    }

  if (stage_x11->xwin != None
      && !stage_x11->is_foreign_xwin
      && !stage_x11->handling_configure) /* Do we want to bother ? */
    XMoveWindow (stage_x11->xdpy,
                 stage_x11->xwin,
                 CLUTTER_UNITS_TO_INT (box->x1),
                 CLUTTER_UNITS_TO_INT (box->y1));

  CLUTTER_ACTOR_CLASS (clutter_stage_x11_parent_class)->request_coords (self,
                                                                        box);
}

static inline void
set_wm_title (ClutterStageX11 *stage_x11)
{
  ClutterBackendX11 *backend_x11 = stage_x11->backend;

  if (stage_x11->xwin == None)
    return;

  if (stage_x11->title == NULL)
    {
      XDeleteProperty (stage_x11->xdpy, 
                       stage_x11->xwin, 
                       backend_x11->atom_NET_WM_NAME);
    }
  else
    {
      XChangeProperty (stage_x11->xdpy, 
                       stage_x11->xwin, 
                       backend_x11->atom_NET_WM_NAME, 
                       backend_x11->atom_UTF8_STRING, 
                       8, 
                       PropModeReplace, 
                       (unsigned char *) stage_x11->title, 
                       (int) strlen (stage_x11->title));
    }
}

static inline void
set_cursor_visible (ClutterStageX11 *stage_x11)
{
  if (stage_x11->xwin == None)
    return;

  CLUTTER_NOTE (BACKEND, "setting cursor state ('%s') over stage window (%u)",
                stage_x11->is_cursor_visible ? "visible" : "invisible",
                (unsigned int) stage_x11->xwin);

  if (stage_x11->is_cursor_visible)
    {
#if 0 /* HAVE_XFIXES - seems buggy/unreliable */
      XFixesShowCursor (stage_x11->xdpy, stage_x11->xwin);
#else
      XUndefineCursor (stage_x11->xdpy, stage_x11->xwin);
#endif /* HAVE_XFIXES */
    }
  else
    {
#if 0 /* HAVE_XFIXES - seems buggy/unreliable, check cursor in firefox 
       *               loading page after hiding.  
      */
      XFixesHideCursor (stage_x11->xdpy, stage_x11->xwin);
#else
      XColor col;
      Pixmap pix;
      Cursor curs;

      pix = XCreatePixmap (stage_x11->xdpy, stage_x11->xwin, 1, 1, 1);
      memset (&col, 0, sizeof (col));
      curs = XCreatePixmapCursor (stage_x11->xdpy, 
                                  pix, pix,
                                  &col, &col,
                                  1, 1);
      XFreePixmap (stage_x11->xdpy, pix);
      XDefineCursor (stage_x11->xdpy, stage_x11->xwin, curs);
#endif /* HAVE_XFIXES */
    }
}

static void
clutter_stage_x11_realize (ClutterActor *actor)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (actor);

  set_wm_title (stage_x11);
  set_cursor_visible (stage_x11);
}

static void
clutter_stage_x11_set_fullscreen (ClutterStageWindow *stage_window,
                                  gboolean            is_fullscreen)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);
  ClutterBackendX11 *backend_x11 = stage_x11->backend;
  ClutterStage *stage = stage_x11->wrapper;
  static gboolean was_resizeable = FALSE;

  if (!stage)
    return;

  if (is_fullscreen)
    {
      if (stage_x11->xwin != None)
        {
          /* if the actor is not mapped we resize the stage window to match
           * the size of the screen; this is useful for e.g. EGLX to avoid
           * a resize when calling clutter_stage_fullscreen() before showing
           * the stage
           */
          if (!CLUTTER_ACTOR_IS_MAPPED (stage_x11))
            {
              gint width, height;

              width  = DisplayWidth (stage_x11->xdpy, stage_x11->xscreen);
              height = DisplayHeight (stage_x11->xdpy, stage_x11->xscreen);

              clutter_actor_set_size (CLUTTER_ACTOR (stage_x11),
                                      width, height);

              /* FIXME: This wont work if we support more states */
              XChangeProperty (stage_x11->xdpy,
                               stage_x11->xwin,
                               backend_x11->atom_NET_WM_STATE, XA_ATOM, 32,
                               PropModeReplace,
                               (unsigned char *) &backend_x11->atom_NET_WM_STATE_FULLSCREEN, 1);
            }
          else
            {
              /* We need to set window user resize-able for metacity at 
               * at least to allow the window to fullscreen *sigh*  
              */
              if (clutter_stage_get_user_resizable (stage) == TRUE)
                was_resizeable = TRUE;
              else
                 clutter_stage_set_user_resizable (stage, TRUE);

              send_wmspec_change_state(backend_x11, stage_x11->xwin,
                                       backend_x11->atom_NET_WM_STATE_FULLSCREEN,
                                       TRUE);
            }

          stage_x11->fullscreen_on_map = TRUE;
        }
    }
  else
    {
      if (stage_x11->xwin != None)
        {
          if (!CLUTTER_ACTOR_IS_MAPPED (stage_x11))
            {
              /* FIXME: This wont work if we support more states */
              XDeleteProperty (stage_x11->xdpy, 
                               stage_x11->xwin, 
                               backend_x11->atom_NET_WM_STATE);
            }
          else
            {
              clutter_stage_set_user_resizable (stage, TRUE);

              send_wmspec_change_state(backend_x11,
                                       stage_x11->xwin,
                                       backend_x11->atom_NET_WM_STATE_FULLSCREEN,
                                       FALSE);

              /* reset the windows state - this isn't fun - see above */
              if (!was_resizeable)
                clutter_stage_set_user_resizable (stage, FALSE);

              was_resizeable = FALSE;
            }

          stage_x11->fullscreen_on_map = FALSE;
        }
    }

  CLUTTER_SET_PRIVATE_FLAGS (stage, CLUTTER_ACTOR_SYNC_MATRICES);
}

static void
clutter_stage_x11_set_cursor_visible (ClutterStageWindow *stage_window,
                                      gboolean            cursor_visible)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);

  stage_x11->is_cursor_visible = (cursor_visible == TRUE);

  set_cursor_visible (stage_x11);
}

static void
clutter_stage_x11_set_title (ClutterStageWindow *stage_window,
                             const gchar        *title)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);

  g_free (stage_x11->title);
  stage_x11->title = g_strdup (title);

  set_wm_title (stage_x11);
}

static void
clutter_stage_x11_set_user_resizable (ClutterStageWindow *stage_window,
                                      gboolean            is_resizable)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);

  clutter_stage_x11_fix_window_size (stage_x11);
}

static ClutterActor *
clutter_stage_x11_get_wrapper (ClutterStageWindow *stage_window)
{
  return CLUTTER_ACTOR (CLUTTER_STAGE_X11 (stage_window)->wrapper);
}

static void
clutter_stage_x11_finalize (GObject *gobject)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (gobject);

  g_free (stage_x11->title);

  G_OBJECT_CLASS (clutter_stage_x11_parent_class)->finalize (gobject);
}

static void
clutter_stage_x11_dispose (GObject *gobject)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (gobject);

  if (stage_x11->xwin)
    clutter_actor_unrealize (CLUTTER_ACTOR (stage_x11));

  G_OBJECT_CLASS (clutter_stage_x11_parent_class)->dispose (gobject);
}

static void
clutter_stage_x11_class_init (ClutterStageX11Class *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);

  gobject_class->finalize = clutter_stage_x11_finalize;
  gobject_class->dispose = clutter_stage_x11_dispose;

  actor_class->realize = clutter_stage_x11_realize;
  actor_class->show = clutter_stage_x11_show;
  actor_class->hide = clutter_stage_x11_hide;
  actor_class->request_coords = clutter_stage_x11_request_coords;
  actor_class->query_coords = clutter_stage_x11_query_coords;
}

static void
clutter_stage_x11_init (ClutterStageX11 *stage)
{
  stage->xdpy = NULL;
  stage->xwin_root = None;
  stage->xscreen = 0;

  stage->xwin = None;
  stage->xwin_width = 640;
  stage->xwin_height = 480;
  stage->xvisinfo = None;

  stage->is_foreign_xwin = FALSE;
  stage->fullscreen_on_map = FALSE;
  stage->handling_configure = FALSE;
  stage->is_cursor_visible = TRUE;

  stage->title = NULL;

  stage->wrapper = NULL;

  CLUTTER_SET_PRIVATE_FLAGS (stage, CLUTTER_ACTOR_IS_TOPLEVEL);
}

static void
clutter_stage_window_iface_init (ClutterStageWindowIface *iface)
{
  iface->get_wrapper = clutter_stage_x11_get_wrapper;
  iface->set_title = clutter_stage_x11_set_title;
  iface->set_fullscreen = clutter_stage_x11_set_fullscreen;
  iface->set_cursor_visible = clutter_stage_x11_set_cursor_visible;
  iface->set_user_resizable = clutter_stage_x11_set_user_resizable;
}

/**
 * clutter_x11_get_stage_window:
 * @stage: a #ClutterStage
 *
 * Gets the stages X Window. 
 *
 * Return value: An XID for the stage window.
 *
 * Since: 0.4
 */
Window
clutter_x11_get_stage_window (ClutterStage *stage)
{
  ClutterStageWindow *impl;

  g_return_val_if_fail (CLUTTER_IS_STAGE (stage), None);

  impl = _clutter_stage_get_window (stage);
  g_assert (CLUTTER_IS_STAGE_X11 (impl));

  return CLUTTER_STAGE_X11 (impl)->xwin;
}

/**
 * clutter_x11_get_stage_from_window:
 * @win: an X Window ID
 *
 * Gets the stage for a particular X window.  
 *
 * Return value: The stage or NULL if a stage does not exist for the window.
 *
 * Since: 0.8
 */
ClutterStage *
clutter_x11_get_stage_from_window (Window win)
{
  ClutterMainContext  *context;
  ClutterStageManager *stage_manager;
  GSList              *l;

  context = clutter_context_get_default ();

  stage_manager = context->stage_manager;

  /* FIXME: use a hash here for performance resaon */
  for (l = stage_manager->stages; l; l = l->next)
    {
      ClutterStage *stage = l->data;
      ClutterStageWindow *impl;

      impl = _clutter_stage_get_window (stage);
      g_assert (CLUTTER_IS_STAGE_X11 (impl));

      if (CLUTTER_STAGE_X11 (impl)->xwin == win)
        return stage;
    }

  return NULL;
}

/**
 * clutter_x11_get_stage_visual:
 * @stage: a #ClutterStage
 *
 * Returns the stage XVisualInfo
 *
 * Return value: The XVisualInfo for the stage.
 *
 * Since: 0.4
 */
XVisualInfo *
clutter_x11_get_stage_visual (ClutterStage *stage)
{
  ClutterStageWindow *impl;

  g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL);

  impl = _clutter_stage_get_window (stage);
  g_assert (CLUTTER_IS_STAGE_X11 (impl));

  return CLUTTER_STAGE_X11 (impl)->xvisinfo;
}

/**
 * clutter_x11_set_stage_foreign:
 * @stage: a #ClutterStage
 * @xwindow: an existing X Window id
 *
 * Target the #ClutterStage to use an existing external X Window
 *
 * Return value: %TRUE if foreign window is valid
 *
 * Since: 0.4
 */
gboolean
clutter_x11_set_stage_foreign (ClutterStage *stage,
                               Window        xwindow)
{
  ClutterStageX11 *stage_x11;
  ClutterStageWindow *impl;
  ClutterActor *actor;
  gint x, y;
  guint width, height, border, depth;
  Window root_return;
  Status status;
  ClutterGeometry geom;

  g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
  g_return_val_if_fail (xwindow != None, FALSE);

  actor = CLUTTER_ACTOR (stage);

  impl = _clutter_stage_get_window (stage);
  stage_x11 = CLUTTER_STAGE_X11 (impl);

  clutter_x11_trap_x_errors ();

  status = XGetGeometry (stage_x11->xdpy, xwindow,
                         &root_return,
                         &x, &y,
                         &width, &height,
                         &border,
                         &depth);
  
  if (clutter_x11_untrap_x_errors () ||
      !status ||
      width == 0 || height == 0 ||
      depth != stage_x11->xvisinfo->depth)
    {
      g_warning ("Unable to retrieve the new window geometry");
      return FALSE;
    }

  clutter_actor_unrealize (actor);

  CLUTTER_NOTE (BACKEND, "Setting foreign window (0x%x)", (int) xwindow);

  stage_x11->xwin = xwindow;
  stage_x11->is_foreign_xwin = TRUE;

  geom.x = x;
  geom.y = y;
  geom.width = stage_x11->xwin_width = width;
  geom.height = stage_x11->xwin_height = height;

  clutter_actor_set_geometry (actor, &geom);
  clutter_actor_realize (actor);

  return TRUE;
}

void
clutter_stage_x11_map (ClutterStageX11 *stage_x11)
{
  /* set the mapped flag on the implementation */
  CLUTTER_ACTOR_SET_FLAGS (stage_x11, CLUTTER_ACTOR_MAPPED);

  /* and on the wrapper itself */
  CLUTTER_ACTOR_SET_FLAGS (stage_x11->wrapper, CLUTTER_ACTOR_MAPPED);

  if (stage_x11->fullscreen_on_map)
    clutter_stage_fullscreen (CLUTTER_STAGE (stage_x11->wrapper));
  else
    clutter_stage_unfullscreen (CLUTTER_STAGE (stage_x11->wrapper));

  clutter_actor_queue_redraw (CLUTTER_ACTOR (stage_x11->wrapper));
}

void
clutter_stage_x11_unmap (ClutterStageX11 *stage_x11)
{
  /* like above, unset the MAPPED stage on both the implementation and
   * the wrapper
   */
  CLUTTER_ACTOR_UNSET_FLAGS (stage_x11, CLUTTER_ACTOR_MAPPED);
  CLUTTER_ACTOR_UNSET_FLAGS (stage_x11->wrapper, CLUTTER_ACTOR_MAPPED);
}